Gemstone with 81 facets



FIG. 1 is the top perspective view of a gemstone with 81 facets, showing my new design;

FIG. 2 is the bottom perspective view thereof;

FIG. 3 is the top view thereof;

FIG. 4 is the bottom view thereof; and,

FIG. 5 is the side view thereof. 

The ornamental design for a gemstone with 81 facets, as shown and described. 